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2014-09-09T01:05:55+07:00

2.
p=3l
kel= 2(p+l)
12 = 2(3l+l)
12 = 2(4l)
12 = 8l
lebar=12/8=1,5
panjang=3 x 1.5 = 4.5

luas = pxl = 1.5 x 4.5 = 6.75
2 3 2